The head with built-in disc moves toward the striking surface at the moment of impact, counteracting the recoil and transmitting only the striking forceThe head center is made sturdier than the types with normal sublenses inside.The flat head has a steel insert and the round head is made of nylon.It can be used for anything from soft and easily damaged materials to hard and sturdy ones.It is securely fixed to the head part, while allowing easy replacement. When replacing, choose a size compatible with 300C (flat/steel insert) or 300B (round).The head center is made of steel, welded, and has a coated finish.The handle is covered in black synthetic rubber while the shaft is made from fiberglass and embedded in the bottom of the shaft tube.